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如何保证鱼尾板与钢轨的有效配合?

答案

参考答案:

鱼尾板上、下端面均为斜面,与轨顶下方和轨顶上方的斜度一样,以使鱼尾板与钢轨密切。螺栓拧紧后,鱼尾板中部与钢轨腹板之间留有一定的空隙,以增加接头的弹性。在钢轨两端的轨腰上和鱼尾板上有椭圆形孔眼,以适应钢轨因温度变化二引起的伸长或缩短。为此,在钢轨街头处应留有不大于5mm的间隙。

阅读理解

Everyone has worries. How do you deal with your worries? There is always something you can do to help yourself feel less worried. Sitting there worrying is no fun and it won't solve your problems.

Grades at school are often a top worry for kids. if you worry most about grades, ask yourself these questions:

●  Why are grades important? What do grades mean to me?

●  How do I get ready for class? Do I go over my notes even when there isn't a test?

●  Do I have a good place to do my homework?

●  Have I tried different ways of studying?

If your worry is about a fight you had with your friend, you might write down al! the things you could do-write a note to him or her, invite him or her to watch a basketball game, say sorry to him or her and so on. Once you have a list of things you could do, you can choose one thing that could get your friend back.

You can ask for help when you're worried. You can find someone to talk to, such as your parents, friends, and teachers.

(  )11. What do kids often worry most about?

 A. Their hobbies.                     B. Their homework.

 C. Their marks at school.               D. A fight with their friends.

(  )12. According to the passage, when you're worried, you'd better _______.

   A. work hard                        B. talk to someone

 C. get ready for class              D. write down your worries

(  )13. If you're worried about grades, DON'T ask yourself "_______".

 A. Why are grades important?           B. What do grades mean to me?

 C. How do I get ready for class?         D. Why not give up my studies?

(  )14. If you had a fight with a friend, you could _______.

A. invite him or her to watch a game      B. put the blame on him or her

C. try to make new friends              D. leave him or her alone

(  )15. What does the passage mainly tell us?

   A. Who is often worried.               B. When people are worried.

  C. How to deal with worries.      D. What kinds of worries people have.

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